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How-To · 5 min read

How Do You Calculate TDS on a Vendor Invoice? A Worked Example With GST

The most common TDS error is deducting on the GST-inclusive total. Five steps set the type, rate, threshold and base, then the net amount to pay.

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Terra Insight Editorial Team Reconciliation Infrastructure

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Published 14 October 2026
Domain expertise
TDS Reconciliation GST Input Credit Platform Settlements NACH Batch Matching Bank Reconciliation Form 26AS Matching ERP Integrations Enterprise Finance Ops
Knowledge Card
Problem

A junior accountant deducts TDS on the GST-inclusive total or forgets the threshold, so the vendor is under-paid or the deduction is short.

How It's Resolved

Identify the payment type, find the rate, test the threshold, set the base before GST where shown separately, then compute TDS and net payable.

Configuration

A rate and threshold table by section or payment code, a running total per vendor per year, and the invoice split between value and GST.

Output

Correct TDS and net payment on every invoice, with no over-deduction on GST.

TDS equals the rate for that payment type multiplied by the invoice value before GST, where GST is shown separately on the invoice. The vendor is paid the invoice total less the TDS.

Worked example

A consultant’s invoice:

LineAmount
Professional fee₹1,00,000
GST at 18 percent₹18,000
Invoice total₹1,18,000

At an assumed 10 percent TDS:

  • Base: ₹1,00,000 (before GST)
  • TDS: ₹1,00,000 × 10 percent = ₹10,000
  • Pay the vendor: ₹1,18,000 − ₹10,000 = ₹1,08,000

The common error is deducting on ₹1,18,000, which gives ₹11,800. That over-deducts ₹1,800, and the vendor has to wait for their tax return to get it back.

The five-step method

StepQuestionIn the example
1. Identify the payment typeContract work, professional fee, rent, commission?Professional fee
2. Find the rateWhat does the section or payment code say?10 percent (payment code 1027 from April 2026)
3. Test the thresholdHas the bill or the year’s total crossed the limit?Yes, over ₹50,000 for the year
4. Set the baseValue before GST, if GST is shown separately₹1,00,000
5. Compute TDS and net payableRate × base; invoice total − TDS₹10,000; ₹1,08,000

Is TDS on the amount with GST or without it?

Without, where GST is shown separately. The CBDT clarified this in Circular 23 of 2017. If the invoice shows one lump sum with no GST split, the base is usually the full amount.

How do thresholds affect the first invoices of the year?

Each section has its own limit. For professional fees under Section 194J the annual limit is ₹50,000 from 1 April 2025. For contractor payments under Section 194C, TDS applies when a single bill exceeds ₹30,000 or the year’s total exceeds ₹1,00,000.

Suppose a contractor (a company, so 2 percent) sends three bills of ₹25,000, ₹25,000 and ₹60,000, all before GST.

  • Bills 1 and 2: each under ₹30,000 and total ₹50,000, so no TDS yet.
  • Bill 3: ₹60,000 is over ₹30,000 and the total is now ₹1,10,000, over ₹1,00,000. TDS is due on the whole ₹1,10,000: 2 percent is ₹2,200, all deducted from bill 3.

So the vendor receives ₹60,000 − ₹2,200 = ₹57,800 (plus GST) on bill 3.

Record the entry and deposit the TDS by the 7th of next month. TransactIG reconciles TDS so over- and under-deductions surface before the return. See TDS reconciliation software and reconciliation software for India.

Primary reference: Income Tax Department e-filing portal — the official source for TDS rates and thresholds by section and payment code..

Frequently Asked Questions

Is TDS calculated on the amount including GST?
Not where GST is shown separately on the invoice. The CBDT clarified in Circular 23 of 2017 that TDS is then worked out on the value excluding GST.
What if GST is not shown separately?
Then TDS is usually worked out on the full invoice amount, because the GST component cannot be identified.
What is the TDS on a ₹1,18,000 invoice with ₹18,000 GST at 10 percent?
₹10,000, worked out on ₹1,00,000. You pay the vendor ₹1,08,000.
Do I deduct TDS on the first small invoices of the year?
Only if the threshold is crossed. Once the annual total crosses the limit, TDS is due on the whole year's amount to date, so the invoice that crosses it carries a larger deduction.
When must I deposit the TDS?
Normally by the 7th of the following month; for amounts deducted in March, by 30 April.

See how TransactIG handles reconciliation for your industry

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